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Service Addendum 45
Table 6-3. Test Points (continued)
Test Point Signal Measurement and Conditions
A4A1/A4A3 LEFT TUNNEL BOARDS (FIGURE 6-6)
Leave meter or scope common connected to test point ((9)) when taking measurements at
test points 47 through 64. The measurements were taken with full-scale voltage and current
programmed. The measurements were made first in the CV mode with no load, and then in the CC mode
with the load set for full-scale voltage and current. Test points are listed for the first regulator (closest to fan)
and the last regulator stages only. The number of regulator stages that will be on (conducting) depends
upon the output current. In the CV mode with no load connected (no output current), only one or two stages
will be on conducting current through the down programmer stages. The remaining regulator stages will be
off (not conducting). In the CC mode with the load set for full-scale output voltage and current, all regulator
stages will be on.
TP47 U201-3 OUTPUT CONTROL
(comparator + input to all stages)
0.05V in CV mode
0.98V in CC mode
TP48 U201-2 Stage 1 comparator -input 0.05V in CV mode
0.98V in CC mode
TP49 U201-1 Stage 1 FET driver input 3.75V in CV mode
4.78V in CC mode
TP51 U202-2 Stage 3 comparator -input 0.05V in CV mode
0.98V in CC mode
TP52 U202-1 Stage 3 FET driver control -0.36V in CV mode
4.65V in CC mode
TP54 U202-5 DP CONTROL 0.22V in CV mode
1.9V in CC mode
TP55 U202-6 DP stage comparator -input 0.22V in CV mode
1.9V in CC mode
TP56 U202-7 DP stage comparator output -0.66V in CV mode
2.47V in CC mode
A4A2/A4A4 RIGHT TUNNEL BOARDS (FIGURE 6-7)
The same measurement conditions apply as described for the A4A1/A4A3 Left Tunnel Boards.
TP58 U301-3 OUTPUT CONTROL 47mV in CV mode
0.99V in CC mode
TP59 U301-2 Stage 1 comparator -input 47mV in CV mode
0.98V in CC mode
TP60 U301-1 Stage 1 FET driver control 3.3V in CV mode
4.75V in CC mode
TP62 U302-2 Stage 4 comparator -input 45mV in CV mode
0.98V in CC mode
TP63 U302-1 Stage 4 FET driver control -0.45V in CV mode
4.5V in CC mode